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Title: Silver doped catalysts for treatment of exhaust

Abstract

A method of making an exhaust treatment catalyst includes dispersing a metal-based material in a first solvent to form a first slurry and allowing polymerization of the first slurry to occur. Polymerization of the first slurry may be quenched and the first slurry may be allowed to harden into a solid. This solid may be redistributed in a second solvent to form a second slurry. The second slurry may be loaded with a silver-based material, and a silver-loaded powder may be formed from the second slurry.

Inventors:
 [1];  [2]
  1. Peoria, IL
  2. Shiloh, IL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
907730
Patent Number(s):
7,153,810
Application Number:
10/874,209
Assignee:
Caterpillar Inc (Peoria, IL) ORO
DOE Contract Number:
FC05-97OR22579
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Park, Paul Worn, and Boyer, Carrie L. Silver doped catalysts for treatment of exhaust. United States: N. p., 2006. Web.
Park, Paul Worn, & Boyer, Carrie L. Silver doped catalysts for treatment of exhaust. United States.
Park, Paul Worn, and Boyer, Carrie L. Tue . "Silver doped catalysts for treatment of exhaust". United States. doi:. https://www.osti.gov/servlets/purl/907730.
@article{osti_907730,
title = {Silver doped catalysts for treatment of exhaust},
author = {Park, Paul Worn and Boyer, Carrie L},
abstractNote = {A method of making an exhaust treatment catalyst includes dispersing a metal-based material in a first solvent to form a first slurry and allowing polymerization of the first slurry to occur. Polymerization of the first slurry may be quenched and the first slurry may be allowed to harden into a solid. This solid may be redistributed in a second solvent to form a second slurry. The second slurry may be loaded with a silver-based material, and a silver-loaded powder may be formed from the second slurry.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 26 00:00:00 EST 2006},
month = {Tue Dec 26 00:00:00 EST 2006}
}

Patent:

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  • A method of making an exhaust treatment element includes washcoating a substrate with a slurry that includes a catalyst support material. At least some of the catalyst support material from the slurry may be transferred to the substrate, and silver metal (Ag) is dispersed within the catalyst support material.
  • The present disclosure pertains to a system and method for treatment of oxygen rich exhaust and more specifically to a method and system that combines non-thermal plasma with a metal doped .gamma.-alumina catalyst. Current catalyst systems for the treatment of oxygen rich exhaust are capable of achieving only approximately 7 to 12% NO.sub.x reduction as a passive system and only 25 40% reduction when a supplemental hydrocarbon reductant is injected into the exhaust stream. It has been found that treatment of an oxygen rich exhaust initially with a non-thermal plasma and followed by subsequent treatment with a metal doped .gamma.-aluminamore » prepared by the sol gel method is capable of increasing the NO.sub.x reduction to a level of approximately 90% in the absence of SO.sub.2 and 80% in the presence of 20 ppm of SO.sub.2. Especially useful metals have been found to be indium, gallium, and tin.« less
  • The lean NOx catalyst includes a substrate, an oxide support material, preferably .gamma.-alumina deposited on the substrate and a metal or metal oxide promoter or dopant introduced into the oxide support material. The metal promoters or dopants are selected from the group consisting of indium, gallium, tin, silver, germanium, gold, nickel, cobalt, copper, iron, manganese, molybdenum, chromium cerium, and vanadium, and oxides thereof, and any combinations thereof. The .gamma.-alumina preferably has a pore volume of from about 0.5 to about 2.0 cc/g; a surface area of between 80 and 350 m.sup.2 /g; an average pore size diameter of between aboutmore » 3 to 30 nm; and an impurity level of less than or equal to about 0.2 weight percent. In a preferred embodiment the .gamma.-alumina is prepared by a sol-gel method, with the metal doping of the .gamma.-alumina preferably accomplished using an incipient wetness impregnation technique.« less
  • A lean NOx catalyst and method of preparing the same is disclosed. The lean NOx catalyst includes a ceramic substrate, an oxide support material, preferably .gamma.-alumina, deposited on the substrate and a metal promoter or dopant introduced into the oxide support material. The metal promoters or dopants are selected from the group consisting of indium, gallium, tin, silver, germanium, gold, nickel, cobalt, copper, iron, manganese, molybdenum, chromium, cerium, vanadium, oxides thereof, and combinations thereof. The .gamma.-alumina preferably has a pore volume of from about 0.5 to about 2.0 cc/g; a surface area of between about 80 to 350 m.sup.2 /g;more » an average pore size diameter of between about 3 to 30 nm; and an impurity level of less than or equal to 0.2 weight percent. In a preferred embodiment the .gamma.-alumina is prepared by a sol-gel method, with the metal doping of the .gamma.-alumina preferably accomplished using an incipient wetness impregnation technique.« less
  • This patent describes a catalyst suitable for use as a catalyst for auto emission control characterized by an alumina support with components deposited thereon consisting essentially of lanthana as a stabilizer in an amount of about 1 to 10% by weight expressed as La/sub 2/O/sub 3/ which is either in the form of lanthana only or in the form of lanthana-rich rare earth oxides where the La/sub 2/O/sub 3/ is at least 50% by weight of the total rare earth oxides, 1-20% by weight of ceria as a promoter, at least 0.5 to about 5% by weight of an alkalimore » metal oxide as a promoter, and a catalytically-effective amount of one or more platinum group metals, the improvement comprising adding H/sub 2/S gettering capability by having the catalyst further comprise: (a) an H/sub 2/S gettering metal oxide selected from the group consisting of oxides of Ni, Fe and mixtures thereof in an amount from an H/sub 2/S gettering effective amount up to 10 weight %, provided that when the H/sub 2/S gettering metal oxide is just NiO, the maximum concentration of the NiO in the first 300 micron layer is at least about twice its average concentration throughout the support; and (b) wherein the alumina support can have additionally from 0 to 20% SiO/sub 2/ present.« less